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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24eca2847f4fdcce754a2f7bee7c13e1cc5f96572102b99a24c848331c1f4874' 
  AND token = 'uopqM1VG3v0OWFHWKqb0LunaE7QMw5XZ6ZanJt6la/E=' 
  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"
    }
  }
}