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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d757c8182dda5157aa8a11700fbb360c372bc8fd3c90f4a1194b23289835d2' 
  AND token = 'UD9IEbq8jFwvHawJCQpzKJysG0d84lNKLf896UqRitw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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