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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327313cebade73dd1e6a9cc2125460de5b78645234c94ea589aac86b1e6b705d' 
  AND token = '9o8eySStfE/9raCj/7G3KnitY/xFR3b6muyIJPEtVFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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