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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b0fe8088537b5c79295fabbef012730b376cabf58bf30a8369340e5e214a91' 
  AND token = 'NGh2ZTRA+p1zNAW3G6N3ArTyLsVtMf77yPEEk82BLf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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