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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bec5abe2608cf7277e8069a162963616b109a73caf0fd4936a254b4688d77f' 
  AND token = '2oXRSplxEWEcjKr6ulEOwNQ6xvZ2MQ4GRLQ9ttXAnL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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