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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df8039ba2afd08296c3180f920ef273d4500cabc12560424046b8e4fcc6e1e2' 
  AND token = '2bw8NBYK41GjlLuTykpxHWsU1ahehW4BHNsXh14Sh8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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