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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde64163c4423f72624d8ddacfdd1e1660dd08a35a7166ec9ddfb22dff1a4b73' 
  AND token = '5bbEbNgGuNck3d1JXxcbCuakOaMg+z1xZpkCSw8wSN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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