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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '30d8b8fcef6fafc95ce48ce7da2584694d513ea345e2b10fe34f4f1fdb6553e5' 
  AND token = 'Ev/VTqD3lPaW8mP2/sR7khKt7h+UfVuDAbIH89st1oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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