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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '13b5056c483acf2781153e14b3c9ffb24e91fa70b621f8cb7bc90d72d62761e6' 
  AND token = 'i2USF9XZDQwH7qU8SFFafsZqn0sfNMMuB7G9ePVsGkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00855

JSON explain

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