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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e9fadb7864fda97a0dd0b77f5ffc4301eae2261ac994cea1c65fbbde6890cb9f' 
  AND token = 'y4ZLpyJdqBfTeQXz+CDl85zorkuC6pTzkQbb9e+FOqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00849

JSON explain

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