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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81378b5ff99c809d03236a4e7aee7690321d8d8d85aa3de3cb6341cfa86d518a' 
  AND token = 'fXOrWeHRpnSMBR+YY53NG3Sf0S2uQbpGhyE8RBgWK+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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