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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c6cd86bd19f5f555759e3e8c2696e71d7c398140babe49b29c769b9e50462a2e' 
  AND token = 'R2w7/SO1Ro3Udg8dCpEIcurxBGIeXF98dVzWbiQRmZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00784

JSON explain

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