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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576093aa25e4634d5068127f0cecefa500d0403f4dc8e9a3db4e8e8bb3dd14d8' 
  AND token = 'LMUg/L/SZqchvh7u/k+dFMUdcPpmThwHP4O3sbXHi5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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