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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8a943bc877296da0d058422ef9b3582aa88ec82ef9e989be2768fa29a1ec6025' 
  AND token = 'B7Ocf+nnQ7vYt1tuP9SfZdAFypWhGDDOa5bhCUonoIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00783

JSON explain

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