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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '488a8eb25338aab494e47a1203c876403d4b080d879977c643480a46d1f4c1be' 
  AND token = 'MxRwpkzIJhDY7Zq+HjtJK/o9e5r5p8Uu7z1aKyx+caA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01069

JSON explain

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