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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9df3924d1e4e9a55fecc215e13749a72e07c018c0803084882715a140f4b4e' 
  AND token = 'cT8SmvAPPwemJJ150EdAb139SmHdzciu1Kr52qjYw1c=' 
  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"
    }
  }
}