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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f2a0e1b0624729af7c97c993969e22cb558c6e06d7ec8ec8b0ee9af7cd792e' 
  AND token = 'psFh7Qwf/2EjMfReTjKAAnvOECaOGHBDm7yb9oBggYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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