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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd0f212de3ea19910ba5070d3f926419f2eb28d15381bf952961138a2dde63db9' 
  AND token = 'CE4OSpRWaPEe5T+Hag/EAlpmGIIdtC0b0vi+SZNSSY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01481

JSON explain

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