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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b0218e337a2a260517e8d0cc3f161742f325d0a11a5dabe692ab22f7aba274' 
  AND token = 'JIJTRlJRe8TJqogHGML/ng2SAfxQuaBbWlWPSCPZF/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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