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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55979928fb55c8575e1fbbf7ca49d516e50f61ed2a5f14c2859775dd1e0b2113' 
  AND token = '9jbOOwAl+DAnAL561fulDtt04Jv4moRsrtKOYzEM8tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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