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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bb49aff251d4f2d263b68b58f56fa561226c94b47b2c4e66b1a2c255dffdfa' 
  AND token = 'zZlpekfn4WFYyMt5lwa+EzfzLkErA0lMm9r0iu4bwDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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