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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8c2a124b0c3d252140a6e44d5257ebefbefbe6d271ec258fac826e3451915561' 
  AND token = 'mcdTK9Rn+Byjx22tFpgQ5d/0xq73btSSsz3lDiSuAZ8=' 
  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"
    }
  }
}