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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3f28906b283b98abfff822d0a0df0fcfeadb298cd910a70efe7f9f3973ac07' 
  AND token = 'AR+42edc0aMLSdRkbhyhC8ibTTuZQG1Q04RnL1Zcdg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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