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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab31aff342663e161da5786efe0bb3992fa3e391dcf7df078dd58eee7b63881e' 
  AND token = 'N+r5nlMGzLXgl6ys17CHEv0TaO6z9njLGO2OVyqllHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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