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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4a2a34e3d691818ba07ab574ec95cf875a8c4de14d38a2007f70973538b8d537' 
  AND token = 'e5V9xVdYKSkZVPpiobURfxRp6kUIWQj987qcR6BuwVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00795

JSON explain

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