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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacda1eb6c147c4ee7faa8660d0805192a259e3006d15d0d8dc35ad66327ae60' 
  AND token = 'perllpEzwiAx5CfhZOK4LI6G6jQQKJdiskNjC+JObYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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