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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '0f5a640353fc61a12e67c081cdf8038a3b6403b4c8ff9d8b1d29ff45e7572999' 
  AND token = '87/kW5C7wVco7z9AXacYr2bya+29ifVobCpyLRHpvIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00943

JSON explain

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