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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a4610e76b3599bffbee6fe0c5c6f7d3aa4825c2d9c522d69028230e644b470' 
  AND token = 'KSUcBjqv7DXpNN7sPrxigQ3jaEonM7v+UIeLmDj1PgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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