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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f072642e13c502c0911d3fe80c0e44c170de0ad2ab4e8a3a8c9fdd130b8d3866' 
  AND token = '6lg4PtSlBJBbkhm61U9PD4jWl5Yv1EsJuvdTmyjZxuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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