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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ffe48f771f5146b2a22dab8f6e0e9010d446f5469c3438921e1a8f33762239d4' 
  AND token = 'JuHxw0Tb71nMPTSMOiqX2oPDirdCd0w9rlZwV9E7MrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00787

JSON explain

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