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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df829fbc865b0b00c1d226f29fc23a61f7759a4b55d46e5508c0900f7517ee1' 
  AND token = 't+Vfja2sFcf9ybOt7VR+SFuGBtWdr4KZZWaAm2J3qJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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