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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a1a61e04a319fd456ed9fb2cd36a43e13ec5eb8e60ce151338b792242d080a' 
  AND token = 'tfsrSw4mFOSm9R7xAaVO0b4hR6u+5s9Udr9F3cnZ2gU=' 
  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"
    }
  }
}