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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5fb6badcd8ddc9d1b2f2192d99dcfe2914bfdccb58a27b35878f381f7db58c38' 
  AND token = 'udDBaYKwAzhXEAo1pJLwINlPhqIC1WIphew6eqrdfZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00746

JSON explain

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