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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '399824f5db85fc1d13401d4c901e69e6a5eb0c5e67f925785958d29af8d9db6b' 
  AND token = 'swzq0vW7NPUBEi370Rfn2snp9BPepdVRcTBmjD74O28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01407

JSON explain

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