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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7faa1d6e01cc1c370c31abb7a722996e7048fbde4be162b765a6d6bc4a1760' 
  AND token = '1sWn4Jw3K/YfniNZxDKxYSvl5roLVPZYjgXHf1lLBKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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