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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4b776db81e48b05dee171e5d80d67374f40ce6bbfe044c4161ef974777bade' 
  AND token = 'pZYoMsjtzVGSI37XM+SpODULIZMRV6e9954YR1tjhUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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