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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149fb886aa28c262e8087e4776c325187ade1a9c49861676968db3b9ddb39857' 
  AND token = '4sQ9An4hwrdV3OrI3hRNX3n2Sq6tOJUlj6Uq6K6QARM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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