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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '387f01bde65b19883de7cd84016fa4e89a1fc81f1121958c7e3b9a0edbd1f9f0' 
  AND token = '8IpWnMGr7UpBDDMrSq6xOm/k1VmnXKyFP7DAXNum+YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00863

JSON explain

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