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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f6717ef070689f4f8f502f773aa1310bf0752d08471b21dc96c08c3d072c75' 
  AND token = 'ii8cIU5gORE+/FTPk+qLGRcq9/Qc/qxl7HtOycnb+7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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