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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de238127aa7f0300e4e3d6633bd742e4c09e82b29e9711ad5064fb41062cb0bf' 
  AND token = '16VjkuKrwsk8VZddSy8HevdTrqhLOdRSkYJw+TfWm4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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