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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1902c043f7edb29babd85f68ddc1f78f7f6302d1f65603f36a0757d033dee3a9' 
  AND token = 'liMzTaHSx+13jwq6N/bWOY/jW9/9KnRi6KHdiKcnfPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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