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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb77996f1a73a45e02176965c21b19b15c661ad8c37785fa52c25adc8c500e8d' 
  AND token = 'spjtRKf1S9no91sU7th5VDx6YL9PqY0N61hb1MeJTZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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