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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bc95304bb720bfb91ddf4c8f04d83ad807526e998bd5f0594cb217928e4f85' 
  AND token = '07hcUEBICPkI6+DIpxCy/4XvPveZchkkAuxuDoj0F80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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