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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6805d7b8c5b2debb1aecc8daa35c14612a4c29391de21f4b85d638a4f09f69' 
  AND token = 'rxaZ8rmPjh8VXuAufsa814pJ40YSYNLgKxi3e/11Aqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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