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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e9477695f58b2f0d6868d1d41fe4ebdcd8a82d81323aecdad6bf2f55a46713' 
  AND token = 'gOoolU7T8TKHAYbLyszOY/uIaQgexnK1KH1qV21hHus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00245

JSON explain

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