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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e0e39342f19e268fc744dfe96df4c83bc11d7ffde008859bda89613ba6c799' 
  AND token = 'jQWD4/3P6118k3HBtZDKbzeUUjW2dNoB+2DpMsDnATU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}