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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef101b67b341b705e34c0dd5496523ad37f9dd1934160762c5a29f7758e8ff8' 
  AND token = 'UNbSHsspXtxnk/S8T1IuTx6B4jWRrUWf8n5+2WjLamw=' 
  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"
    }
  }
}