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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0cd0f29c24690dc375f3756cad369773d8e9e5a17372f5d60deaf8fc6f4f60' 
  AND token = 'aNS55jHeAXBYfdeA+N/8Lf7W3xO9UC25ur/X6y9JeI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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