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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e916a260672febd237dc39b1d7c1777915dfd6410527a86ac9706bdf1b1183' 
  AND token = 'ZyNYm9/Ssyin9BR2W/5gRl+DwH7rsO6SGrL+66gqv4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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