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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29479b6812331c0c336876ca8e5b0a9d283cca20c27a3946bb914d5b22f69cd0' 
  AND token = 'Q0+4SRi69HgT9PDVb/SIOvEb6zgkGMaObEid6ncI0Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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