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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48cac6b127c6924d45b683c1a3e2e5b5c5d6497c0587d829111eb0f57d22c620' 
  AND token = 'Q5zG99XB9C3q4hdv2vUxzi0box6BHSWYM8vn9j7A5M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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