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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8452d6f3939493a86cf9c5b57ca5285aafa77d3017d33472290e645129ad4739' 
  AND token = 'AXPddizIA686lhZCy2HgnOiJbIsQC2LcZhwYTbKNg54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00759

JSON explain

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