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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '06eb00a4cf6c6069f80534dc77f8687b201db0763a1720d3efc9078435574dd3' 
  AND token = 'EyBDnx/4iY5v/aucrfmfm+4RB1yg0TwgTpgSMKWqwuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00754

JSON explain

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