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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065e90f88e1cb2086658fd472801ae1e29ec76eec4c98f672845f2411e4bf6da' 
  AND token = 'kVPBx7DLb0vMSyBKExOJg5zntbz7WbNKb+/Ow/PrhZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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