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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e609e53a3956acf9b9211cb94f25f2c10c89301366c5d7910170a4af6a78343e' 
  AND token = 'dxmNd8qvlzaF1q+OlgSCCISJr0iuOfBdILIWsVQ0/i8=' 
  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"
    }
  }
}