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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a09e302b20c030492c8fef332f6a210a57e07e6a05a69708fd9959e7eff4b74' 
  AND token = 'GD9bjxLFJKLZ1vaMX4vrSkbhMUjEYMuyBGHZk1k2gww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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