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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '960d83573b9301b7437c53d1abc19811cf4336a324b75d3a1f06f82587e3971a' 
  AND token = 'nh7ib8UNzOYjtl2p0avZgdPtt3n2pxkYQ7Ei1zungPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00744

JSON explain

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