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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a3661584f1bb3101b7fdf91b7e7e8da72fa52c0ee200a40a93513fd52136dd' 
  AND token = 'jbBJDFXAVv/CMrJnJjdJr9yUNn+C0pr5zDbO7vOIpAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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