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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a8a8867fa3d39d216ce905efb5bd51bb9a4c64ee2b953d345535f4e39299c125' 
  AND token = '6OePP217+NzJ559uqFxSjLpreUC3GMMGkBNecZ4MMYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01552

JSON explain

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