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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe3d2bfa4d33edab482d5039b89346e7e33c770614dac89cc63a95e279b7b67' 
  AND token = 'o9fkL9YZ2ig1R4oy1AAhbsdMt9rdNeySFO2Yeohc9yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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