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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c1ee1713ae7a0dbbacddf867010e8853e360dc92eb2edf3cd8b9564ba576fff9' 
  AND token = 'PC7eCthjDnpdsBJd91ZEKChyPuXgaD1yVsyaC+gwbws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01588

JSON explain

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