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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51047ea090d2ab5e4288c955506162c7f8c24029ffbf3b67b8837f637def10d6' 
  AND token = 'i3s/PzVCPABocn6/Uyi8caZsAhYa/DL07I5VQswlaJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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