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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8af833d32a1f82aae48a576cb58aa891f5937e51c65b70f979bd4f15aa15f62' 
  AND token = '8Yn060sxe6FfloT7TqX4IpVeqgsdl/2v7rpPxpUuhVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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