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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1419f78575b4c7fe9836bfe524e1ed6eff93e9f4eb0175eec8351ae685a1e2' 
  AND token = 'rre0oZFDHlkp6pQ3jnJrwleBHjyqBRoK73NHICytezs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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