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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20586ec6e419b965cb5844e7d169cc73c4abd73c54acb57acba4d549c2cec634' 
  AND token = '34EwHhcbm07+yeI3kUyZ1PYYK76GTsFPPY7r+5/96sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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