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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9964921928bb7c1efa8a0a938d5f9afb40351e25a72a93836ae6dcd05dde1e9e' 
  AND token = 'QesAQFPDed72qI+BcQFcSB3oAzuZz1Af2pYbNbhT0N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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