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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563521bdb8038fde4ef72660e4d6a230203db0c61b63fc67381ca73149b032b9' 
  AND token = '6RfvkN7MCQ/TPeaZtxMcBv7r+JUrGTJDzFPtXdX5uBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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