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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b58fdc9e9ac2127803080d8e323c24b958038739630f8a03982acd06467644a7' 
  AND token = 'KHwPNKbm7MpdIr8Fy826LikFndIeL2/9GQHfFoCQMIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00768

JSON explain

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