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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7208f8aa88f668e16629440cae81b82d7dd20aef320f76b890a6f86e990f08' 
  AND token = '3yF5fAOR8L791/g7O7Cf3mINQpoyyufWklSEfLnjm7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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