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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace3dcfb2038e6248f4d276a27ce0fb5f386548242ededba6e08c2d65b4a544d' 
  AND token = 'ceEPYk+okXwawgP/f+jaT2eeUOuFFE4C81bopWBxbe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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