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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a38e3760b573cae520c90a7a183d21517f2ab7c823bc3989eaf53bcda10e41' 
  AND token = '2LlcUYz/GRdejmvnGSa3urZD50OarM8QejO1KpxOw5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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