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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e5087cc9a3b1dfd9a7f55f23f8a4795f056087d43155e062422da9318d47b4' 
  AND token = 'HWENOraWPrDHpam7XjfI9b4n16eS0+BeJNJZ8seU9B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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