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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a80011fe0cde2dde2253f0ef69823ca5fa47ba5400ad64b707faf2c46c873c' 
  AND token = 'aY0xkaac1W8eNLAPsCnqBQYDdXyoYjRn191uMwIk6lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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