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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'bb77a106f962bf15a146ed0cc2af10f30af172aa8298eb70a6b7b4a7a1f3f055' 
  AND token = 'JVPD7N8qNl0cHHV0mjP63SecWmiNX7EPsLdG+GYZMV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00801

JSON explain

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