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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45213a86195550d6f47c0c7eade119ead8e0a06a2388bef4b6e56df14bd17395' 
  AND token = 'z8WSYD5o5h4GTmlck61sOcMXE7LGRKqKuYCodcCTM/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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