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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbd8124203e2d69067f53594079426798cfd0a6973e22da0ad59f79269a69a1' 
  AND token = 'e4GnhDLlahG1WdFzk6LHy/YdJi4e6CJfv5eZwPbmBYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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