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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd98258c77b0c7e09718bd5032286af1cbe9d95825b85542f6805fb835117da' 
  AND token = 'bcNwc36v+9A8bel9+SF6wUXICvfzs15DDn+/GyReCFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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