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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acc012a325c776e891d25edb95b29612b34f04325d830a6ce8c8ca40d6031ef' 
  AND token = 'EvtU+DklrLUKoK9fnG+nA5qBT3kFcy+zzUlMmB00ZQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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